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+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package CodeIgniter
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
+ * @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license http://opensource.org/licenses/MIT MIT License
+ * @link http://codeigniter.com
+ * @since Version 3.0.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * CodeIgniter Session Driver Class
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Sessions
+ * @author Andrey Andreev
+ * @link http://codeigniter.com/user_guide/libraries/sessions.html
+ */
+abstract class CI_Session_driver implements SessionHandlerInterface {
+
+ protected $_config;
+
+ /**
+ * Data fingerprint
+ *
+ * @var bool
+ */
+ protected $_fingerprint;
+
+ /**
+ * Lock placeholder
+ *
+ * @var mixed
+ */
+ protected $_lock = FALSE;
+
+ /**
+ * Read session ID
+ *
+ * Used to detect session_regenerate_id() calls because PHP only calls
+ * write() after regenerating the ID.
+ *
+ * @var string
+ */
+ protected $_session_id;
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Class constructor
+ *
+ * @param array $params Configuration parameters
+ * @return void
+ */
+ public function __construct(&$params)
+ {
+ $this->_config =& $params;
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Cookie destroy
+ *
+ * Internal method to force removal of a cookie by the client
+ * when session_destroy() is called.
+ *
+ * @return bool
+ */
+ protected function _cookie_destroy()
+ {
+ return setcookie(
+ $this->_config['cookie_name'],
+ NULL,
+ 1,
+ $this->_config['cookie_path'],
+ $this->_config['cookie_domain'],
+ $this->_config['cookie_secure'],
+ TRUE
+ );
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Get lock
+ *
+ * A dummy method allowing drivers with no locking functionality
+ * (databases other than PostgreSQL and MySQL) to act as if they
+ * do acquire a lock.
+ *
+ * @param string $session_id
+ * @return bool
+ */
+ protected function _get_lock($session_id)
+ {
+ $this->_lock = TRUE;
+ return TRUE;
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Release lock
+ *
+ * @return bool
+ */
+ protected function _release_lock()
+ {
+ if ($this->_lock)
+ {
+ $this->_lock = FALSE;
+ }
+
+ return TRUE;
+ }
+
+}